• Title, Summary, Keyword: retentate

Search Result 61, Processing Time 0.039 seconds

Effect of Kefir Extract on th Growth of Serum-Free Mouse Embyro (SFME) Cells

  • Jang, Hae-Dong;David Barnes
    • Preventive Nutrition and Food Science
    • /
    • v.5 no.4
    • /
    • pp.225-229
    • /
    • 2000
  • The antioxidative and protective activities of kefir, low-fat dry milk (NFDM) extract and fractions on SFME cells in serum-free medium were investigated. Kefir and low-fat kefir and NFDM extract were made by solubilizing the freeze dried powder forms in deionized water, filtering through glass prefilter, 12 ㎛ and 2 ㎛ membrane, and demineraling with chelating resin. Kefir, low-fat kefir and NFDM extract were fractioned into dialyzate and retentate by dialysis with membrane tube having the molecular cut-off of 3,500 Dalton. An antioxidative activity was analyzed by the in vitro model system using a linoleic acid. In the case of kefir an antioxidative activity was detected only in the retentate of kefir extract. On the other hand NFDM showed an antioxidative activity in extract, demineralized extract, dialyzate and retentate. The retentate of kefir extract had the higher antioxidative activity than that of NFDM extract. Kefir showed the protective effect of SFME cells in serum-free medium in extract, demineralized extract and retentate, but low-fat kefir didn't. NFDM had the similar protective effect on SFME cells as extract, demineralized extract and retentate of kefir.

  • PDF

A comparative study on SBR and MLE Process for RO Retentate Treatment (RO 농축수 처리를 위한 SBR과 MLE 공정의 비교 평가)

  • Kim, Il-Whee;Lee, Sang-Il
    • Journal of Korean Society of Water and Wastewater
    • /
    • v.25 no.6
    • /
    • pp.907-915
    • /
    • 2011
  • In this study, the SBR and MLE process was performed for a removal of the RO retentate and the nitrogen removal efficiency was evaluated. The inflow-rate of two processes was set a 10 L/day. The SBR process was operated a two cycle as HRT per one cycle was 12hr and the HRT of the anoxic and aerobic tank was respectively 7.5 hr and 16.5 hr. The methanol was injected for an effective denitrificaion owing to a low C/N ratio of the RO retentate. The two processes were effectively performed for nitrogen removal, but the average removal efficiency of the SBR process was about 94.93% better performance than the MLE process. Therefore, the SBR process demonstrated a good performance more than the MLE process for nitrogen removal of the RO retentate. The kinetic of SNR and SDNR was observed respectively 0.051 kg $NH_{3}-N/kg\;MLVSS{\cdot}dayg$ and 0.287 kg ${NO_3}^--N/kg\;MLVSS{\cdot}day$, which will be useful to design for the wastewater treatment system with a RO retentate.

Optimization of Membrane Separation Process for the Production of Dietary Fibers from Tangerine Peels (감귤 과피 유래 식이섬유 생산을 위한 막분리 공정 최적화)

  • Woo, Gun-Jo;Nam, Jin;Eun, Jong-Bang
    • Korean Journal of Food Science and Technology
    • /
    • v.28 no.2
    • /
    • pp.378-383
    • /
    • 1996
  • Dietary fibers (DF) have been used as functional food components due to the various health promoting activities. Dietary fibers have been separated from the peels of Korean tangerine by employing ultrafiltration (UF) membranes. Optimum conditions in a batch type ultrafiltration unit using YM100 (molecular weight cut-off, MWCO=100,000), YM 10 (MWCO=10,000) and YM1 (MWCO=1,000) membranes were : transmembrane pressure 7.5 psi, temperature of the peel extracts $35^{\circ}C$, and pH of the peel extract 3.0, respectively. The flux in YM 10 membrane unit was higher than that in YM 10 or YM 1 membrane unit. However, YM 100 membrane was superior to YM 10 or YM 1 membrane with respect to the recovery of the retentate and the contents of DF The contents of DF in the tangerine peel extract, in the 170 mesh retentate, and in the YM 100 retentate were shown to be 33.4%, 18.5% and 8.4% based on dry matter, respectively. Most dietary fibers were recovered at the separation stages of 170 mesh and YM 100.

  • PDF

Study on the Separation of N2/SF6 Mixture Gas Using Polyimide Hollow Fiber Membrane (폴리이미드 중공사 막을 이용한 N2/SF6 혼합기체 분리에 관한 연구)

  • Kim, Dae-Hoon;Kim, Guang-Lim;Jo, Hang-Dae;Park, Jong-Soo;Lee, Hyung-Keun
    • Korean Chemical Engineering Research
    • /
    • v.48 no.5
    • /
    • pp.660-667
    • /
    • 2010
  • In this research polyimide, Matrimid 5218, hollow fiber membrane was used to recover sulfur hexafluoride($SF_6$) which is one of the six greenhouse gases from $N_2/SF_6$ mixture gas. Fibers were spun from using dry-wet phase inversion method. The module was manufactured by fabricating fibers after surface coating with silicone elastomer. The scanning electron microscopy(SEM) studies showed that the produced fibers typically had an asymmetric structure; a dense top layer supported by a sponge-like substructure. The developed module had a permeance of 0.78-1.36 GPU for $N_2$ with $N_2/SF_6$ selectivity of 2.44-5.08 at various pressure and temperature. For recovery of $SF_6$, a membrane module and 10 vol.% $SF_6$ from $N_2/SF_6$ mixture gas was used. The effects of various operating condition such as pressure, temperature, and retentate side flow rate were tested. When pressure and temperature were increased and retentate flow rate was decreased, the $SF_6$ purity in recovered gas was increased up to 37.5 vol.% with decreasing recovery ratio. When retentate flow rate was increased pressure and temperature was decreased, the $SF_6$ recovery ratio in retentate side was increased up to 89% with decreasing the $SF_6$ purity in retentate side.

Functional Properties of Sunmul (Soybean Curd Whey) Concentrate by Ultrafiltration (한외여과에 의한 순물 농축액의 기능적 특성)

  • Kim, You-Pung;Eom, Sang-Mi;Chang, Eun-Jung;Kim, Woo-Jung;Oh, Hoon-Il
    • Korean Journal of Food Science and Technology
    • /
    • v.38 no.4
    • /
    • pp.488-494
    • /
    • 2006
  • This study was carried out in order to investigate the feasibility of utilizing concentrated sunmul (soybean curd whey), which is a waste by-product of soybean curd processing, as a functional food ingredient. Sunmul Powder was concentrated by ultrafiltration and spray dried with or without dextrin. Oil adsorption capacity of UF retentate powder was similar to that of ISP (Isolated Soy Protein) and higher than that of sunmul powder, whereas water holding capacity of UF retentate powder was lower than that of ISP. Protein solubility of all types of UF retentate powder was significantly higher than that of ISP at pH 2.0-10.0 with the lowest protein solubility seen at pH 4.0 and solubility increasing as the conditions became more acidic or alkaline. Emulsifying activity indexes of UF retentate powder at pH 2.0-10.0 were not influenced by pH. Emulsion stability of 4% sunmul solution was lowest at pH 4.0, but that of UF retentate powder was higher at acidic pH values and decreased with increasing pH. Foaming capacities of sunmul and UF retentate powder were high at pH 4.0-6.0, but the foam of UF retentate powder disappeared within 20 minutes in all conditions of pH.

Numerical Analysis for Separation of Methane by Hollow Fiber Membrane with Cocurrent Flow (병류흐름 중공사 분리막에 의한 메탄 분리 수치해석)

  • Lee, Seungmin;Seo, Yeonhee;Kang, Hanchang;Kim, Jeonghoon;Lee, Yongtaek
    • Korean Chemical Engineering Research
    • /
    • v.53 no.3
    • /
    • pp.295-301
    • /
    • 2015
  • A theoretical analysis was carried out to examine the concentration behavior of methane from a biogas using a polysulfone membrane. After the governing equations were derived for the cocurrent flow mode in a membrane module, the coupled nonlinear differential equations were numerically solved with the Compaq Visual Fortran 6.6 software. At the typical operating condition of mole fraction of 0.7 in a feed stream, the mole fraction of methane in the retentate increased to 0.76 while the normalized retentate flow rate to the feed flow rate decreased from 1 to 0.79. When either the mole fraction of methane in a feed increased or the pressure of the feed stream increased, the methane mole fraction in the retentate increased. On the other hand, it was found that as either the membrane area decreased or the ratio of the permeate pressure to the feed pressure increased, the methane mole fraction in the retentate decreased. In case that the stage cut increased, the methane mole fraction in the retentate increased while the recovery of methane slightly decreased.

A Study on Application of SBR Process for RO Retentate Treatment (RO 농축수 처리를 위한 SBR 공정 적용에 관한 연구)

  • Kim, Il-Whee;Joo, Hyun-Jong
    • Journal of Korean Society of Environmental Engineers
    • /
    • v.34 no.2
    • /
    • pp.79-85
    • /
    • 2012
  • In this study, Application of sequencing batch reactor (SBR) process for RO retentate treatment was performed. Efficiency of treatment by load and temperature variation was tested. The SBR process was operated two types as HRT per one cycle was 8 and 12 hours, respectively. Methanol was injected for an effective denitrificaion owing to low C/N ratio of the RO retentate. TN removal efficiency of the SBR process was relatively stable at the change of flow-rate and temperature. The optimum time cycle of SBR process was 2 cycle/day for TN removal, and in the case of 3 cycle/day, the effluent TN concentration was found under the effluent quality standard. In the result of assessment, the application of SBR process for RO retentate treatment was effective and could be utilized to design for the wastewater treatment plant. The specific nitrification rate (SNR) and specific denitrification rate (SDNR) were $0.043{\sim}0.066kg\;NH_3-N/kg\;MLVSS{\cdot}day$ and $0.096{\sim}0.287kg\;NH_3^--N/kg\;MLVSS{\cdot}day$, respectively. The derived kinetic could be applied for design to the aerobic and anoxic tank in the RO retentate treatment.

Simulation on Concentration of CH4 Using Hollow Fiber Membrane Permeator with Countercurrent Flow (향류 흐름 중공사 분리막의 메탄 농축 수치해석)

  • Seo, Yeonhee;Lee, Seungmin;Park, Sungeun;Jung, Woojin;Kim, Jeonghoon;Lee, Yongtaek
    • Membrane Journal
    • /
    • v.24 no.3
    • /
    • pp.223-230
    • /
    • 2014
  • A numerical analysis was performed for concentration of methane from the biogas using a polysulfone hollow fiber membrane permeator. Governing equations were derived for the countercurrent flow and numerically solved by using the Compaq Visual Fortran 6.6 software. When the methane mole fraction of feed was 0.5, the mole fraction of retentate increased from 0.5 to 0.8; the normalized retentate flow rate to the feed flow rate decreased from 1.0 to 0.57 at the given typical operating condition as the feed gas flowed from the inlet to the outlet of the membrane. As the methane mole fraction of feed was changed to 0.9, the methane mole fraction of retentate became 0.93 and the normalized retentate flow rate was changed to 0.91. When the pressure ratio of the permeate to the feed was varied from 0.33 to 0.17, there was a little difference in the methane mole fraction of retentate for the low stage cut of 0.1, whereas there was an significant increment for the high stage cut of 0.3. The retentate methane mole fraction remained relatively high despite the change of a stage cut as the area of the membrane increased from $1.14m^2$ to $2.57m^2$.

가교된 PVA/PAA막을 이용한 물-페놀 계의 투과증발 분리

  • 임지원;손민영;이규호
    • Proceedings of the Membrane Society of Korea Conference
    • /
    • /
    • pp.58-59
    • /
    • 1992
  • 투과 증발법에 의한 유기 성분을 포함하는 물의 농축은 일반적으로 water-selective와 organic-selective인 2개의 투과 증발 장치를 연결하여 사용되어지며 이때 organic permeate는 재순환되고 그리고 organic retentate는 회수되어지며, water retentate는 다른 곳에 사용된다. 본 논문에서는 이중 두번째 단계인 water- selective 막을 이용한 투과 증발 분리에 대해 조사하였다.

  • PDF

Physico-chemical Properties of Soybean Curd Whey Concentrated by Reverse Osmosis (역삼투법으로 분리, 농축한 두부순물의 이화학적 특성)

  • Kim, Dong-Man;Baek, Hyung-Hee;Jin, Jae-Soon;Lee, Sei-Eun;Kim, Kil-Hwan
    • Korean Journal of Food Science and Technology
    • /
    • v.24 no.4
    • /
    • pp.311-314
    • /
    • 1992
  • Several Physico-chemical properties of the retentate obtained from reverse osmosis of soybean curd whey were studied. The contents of sucrose, raffinose and stachyose in the retentate were 32.59%d.b., 4.76%d.b. and 9.99%d.b., respectively. Potassium (5.23%d.b.), in the retentate was a dominant element in ash. Protein content (18.69%d.b.), amino acid composition and subunit pattern of protein in PAG-electrophoresis were somewhat different from those of the soybean protein. Emulsification activity, emulsification stability and viscosity of protein isolated from soybean curd whey (WPI) were slightly inferior compared to protein isolated from soybean (SPI), with the exception of solubility that depended on the pH of WPI.

  • PDF